FBI says it presumes base shooting was act of terrorism

FILE- In this Jan. 29, 2016 file photo shows the entrance to the Naval Air Base Station in Pensacola, Fla. The US Navy is confirming that an active shooter and one other person are dead after gunfire at the Naval Air Station in Pensacola. Area hospital representatives tell The Associated Press that at least 11 people were hospitalized. The base remains locked down amid a huge law enforcement response. (AP Photo/Melissa Nelson, File)

PENSACOLA, Fla. — The Saudi gunman who killed three people at the Pensacola naval base apparently went on Twitter shortly before the shooting to blast U.S. support of Israel and accuse America of being anti-Muslim, a U.S. official said Sunday as the FBI confirmed it is operating on the assumption the attack was an act of terrorism.